fix(examples): Fix AdvancedWebServer.ino uptime conversion

Author: cydanil

libraries/WebServer/examples/AdvancedWebServer/AdvancedWebServer.ino

@@ -44,8 +44,9 @@ void handleRoot() {
   digitalWrite(led, 1);
   char temp[400];
   int sec = millis() / 1000;
-  int min = sec / 60;
-  int hr = min / 60;
+  int hr = sec / 3600;
+  int min = (sec / 60) % 60;
+  sec = sec % 60
 
   snprintf(temp, 400,